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#include <config.h>
#include <stdio.h>
#include <math.h>
#include "GFilter.h"
/* GFilter is an abstract decendant of GImage. Derivatives of this class can
* be used to filter an image in some way (scale, rotate, etc).
*
* Written by: Chris Studholme
* Last Update: 25-May-2000
* Copyright: GPL (http://www.fsf.org/copyleft/gpl.html)
*/
inline short boundcheck(int x) {
if (x<-32768) return -32768;
if (x>32767) return 32767;
return x;
}
/* ================ GFilter_GammaCorrection methods ================ */
inline void GammaCorrect(short& red, short& green, short& blue, short* table) {
red = *(short*)(((char*)table)+(red&0xFFFE));
green = *(short*)(((char*)table)+(green&0xFFFE));
blue = *(short*)(((char*)table)+(blue&0xFFFE));
}
void GFilter_GammaCorrection::setGammaCorrection(float gamma) {
// create table
if (table)
delete[] table;
table = new short[32768];
// fill table
float offset = (1-gamma)*log(range);
for (int i=-32768; i<32768; ++i) {
short e;
if ((i<=min)||(i>=min+range))
e=i;
else
e=min+(int)exp((log(i-min)-offset)/gamma);
*(short*)(((char*)table)+(i&0xFFFE))=e;
}
}
void GFilter_GammaCorrection::getPixel(short& red, short& green, short& blue,
float x1, float y1, float x2, float y2) {
src.getPixel(red,green,blue,x1,y1,x2,y2);
GammaCorrect(red,green,blue,table);
}
void GFilter_GammaCorrection::getScanLineHorz(short* red, short* green, short* blue,
float x1, float y1, float x2, float y2, int npixels) {
src.getScanLineHorz(red,green,blue,x1,y1,x2,y2,npixels);
for (int i=0; i<npixels; ++i)
GammaCorrect(red[i],green[i],blue[i],table);
}
void GFilter_GammaCorrection::getScanLineVert(short* red, short* green, short* blue,
float x1, float y1, float x2, float y2, int npixels) {
src.getScanLineVert(red,green,blue,x1,y1,x2,y2,npixels);
for (int i=0; i<npixels; ++i)
GammaCorrect(red[i],green[i],blue[i],table);
}
/* ================ GFilter_ContrastAdjustment methods ================ */
#define CONTRAST_ADJUST(pixel) pixel=boundcheck((pixel-min)*32768/diff-16384)
void GFilter_ContrastAdjustment::getPixel(short& red, short& green, short& blue,
float x1, float y1,
float x2, float y2) {
src.getPixel(red,green,blue,x1,y1,x2,y2);
CONTRAST_ADJUST(red);
CONTRAST_ADJUST(green);
CONTRAST_ADJUST(blue);
}
void GFilter_ContrastAdjustment::getScanLineHorz(short* red, short* green, short* blue,
float x1, float y1, float x2, float y2, int npixels) {
src.getScanLineHorz(red,green,blue,x1,y1,x2,y2,npixels);
for (int i=0; i<npixels; ++i) {
CONTRAST_ADJUST(red[i]);
CONTRAST_ADJUST(green[i]);
CONTRAST_ADJUST(blue[i]);
}
}
void GFilter_ContrastAdjustment::getScanLineVert(short* red, short* green, short* blue,
float x1, float y1, float x2, float y2, int npixels) {
src.getScanLineVert(red,green,blue,x1,y1,x2,y2,npixels);
for (int i=0; i<npixels; ++i) {
CONTRAST_ADJUST(red[i]);
CONTRAST_ADJUST(green[i]);
CONTRAST_ADJUST(blue[i]);
}
}
/* ================ GFilter_Scale methods ================ */
void GFilter_Scale::calculateConstants() {
float ow = (float)((h*src.getWidth()*src.getAspectRatio())/(src.getHeight()*aspectratio));
float oh = (float)((w*src.getHeight()*aspectratio)/(src.getWidth()*src.getAspectRatio()));
if (w<ow) // width cropped
oh=h;
else if (h<oh) // height cropped
ow=w;
xfactor=src.getWidth()/ow;
yfactor=src.getHeight()/oh;
xoffset=(ow-w)/2;
yoffset=(oh-h)/2;
}
void GFilter_Scale::getPixel(short& red, short& green, short& blue,
float x1, float y1, float x2, float y2) {
src.getPixel(red,green,blue,xoffset+xfactor*x1,yoffset+yfactor*y1,
xoffset+xfactor*x2,yoffset+yfactor*y2);
}
void GFilter_Scale::getScanLineHorz(short* red, short* green, short* blue,
float x1, float y1, float x2, float y2, int npixels) {
src.getScanLineHorz(red,green,blue,xoffset+xfactor*x1,yoffset+yfactor*y1,
xoffset+xfactor*x2,yoffset+yfactor*y2,npixels);
}
void GFilter_Scale::getScanLineVert(short* red, short* green, short* blue,
float x1, float y1, float x2, float y2, int npixels) {
src.getScanLineVert(red,green,blue,xoffset+xfactor*x1,yoffset+yfactor*y1,
xoffset+xfactor*x2,yoffset+yfactor*y2,npixels);
}
/* ================ GFilter_Rotate methods ================ */
void GFilter_Rotate::getPixel(short& red, short& green, short& blue,
float x1, float y1, float x2, float y2) {
switch (degree) {
case 0:
src.getPixel(red,green,blue,x1,y1,x2,y2);
return;
case 90:
src.getPixel(red,green,blue,y1,src.getHeight()-x2,
y2,src.getHeight()-x1);
return;
case 180:
src.getPixel(red,green,blue,src.getWidth()-x2,src.getHeight()-y2,
src.getWidth()-x1,src.getHeight()-y1);
return;
case 270:
src.getPixel(red,green,blue,src.getWidth()-y2,x1,
src.getWidth()-y1,x2);
return;
}
// rotate angle must be a multiple of 90 degrees
red=green=blue=0;
}
void GFilter_Rotate::getScanLineHorz(short* red, short* green, short* blue,
float x1, float y1,
float x2, float y2, int npixels) {
switch (degree) {
case 0:
src.getScanLineHorz(red,green,blue,x1,y1,x2,y2,npixels);
return;
case 180:
src.getScanLineHorz(red,green,blue,src.getWidth()-x1,src.getHeight()-y2,
src.getWidth()-x2,src.getHeight()-y1,npixels);
return;
case 90:
src.getScanLineVert(red,green,blue,y1,src.getHeight()-x1,
y2,src.getHeight()-x2,npixels);
return;
case 270:
src.getScanLineVert(red,green,blue,src.getWidth()-y2,x1,
src.getWidth()-y1,x2,npixels);
return;
}
GImage::getScanLineHorz(red,green,blue,x1,y1,x2,y2,npixels);
}
void GFilter_Rotate::getScanLineVert(short* red, short* green, short* blue,
float x1, float y1,
float x2, float y2, int npixels) {
switch (degree) {
case 0:
src.getScanLineVert(red,green,blue,x1,y1,x2,y2,npixels);
return;
case 180:
src.getScanLineVert(red,green,blue,src.getWidth()-x2,src.getHeight()-y1,
src.getWidth()-x1,src.getHeight()-y2,npixels);
return;
case 90:
src.getScanLineHorz(red,green,blue,y1,src.getHeight()-x2,
y2,src.getHeight()-x1,npixels);
return;
case 270:
src.getScanLineHorz(red,green,blue,src.getWidth()-y1,x1,
src.getWidth()-y2,x2,npixels);
return;
}
GImage::getScanLineVert(red,green,blue,x1,y1,x2,y2,npixels);
}
/* ================ GFilter_WhiteBalance methods ================ */
#define WHITE_BALANCE(pixel,diff) pixel=(pixel+16384)*diff/32768-16384
void GFilter_WhiteBalance::getPixel(short& red, short& green, short& blue,
float x1, float y1,
float x2, float y2) {
src.getPixel(red,green,blue,x1,y1,x2,y2);
WHITE_BALANCE(red,rdiff);
WHITE_BALANCE(green,gdiff);
WHITE_BALANCE(blue,bdiff);
}
void GFilter_WhiteBalance::getScanLineHorz(short* red, short* green, short* blue,
float x1, float y1, float x2, float y2, int npixels) {
src.getScanLineHorz(red,green,blue,x1,y1,x2,y2,npixels);
for (int i=0; i<npixels; ++i) {
WHITE_BALANCE(red[i],rdiff);
WHITE_BALANCE(green[i],gdiff);
WHITE_BALANCE(blue[i],bdiff);
}
}
void GFilter_WhiteBalance::getScanLineVert(short* red, short* green, short* blue,
float x1, float y1, float x2, float y2, int npixels) {
src.getScanLineVert(red,green,blue,x1,y1,x2,y2,npixels);
for (int i=0; i<npixels; ++i) {
WHITE_BALANCE(red[i],rdiff);
WHITE_BALANCE(green[i],gdiff);
WHITE_BALANCE(blue[i],bdiff);
}
}
/* ================ GFilter_BarrelCorrection methods ================ */
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